Description: This function creates sectional line data on the selected surface.
Usage:
1. DSI prompts the user to select a surface on the screen.
2. Once the surface is selected, DSI places edge numbers on the surface and prompts the user to enter a number of section lines along edges 1 and 2.
3. DSI creates a set of section lines along edges 1 and 2. These lines are included in the current part.